中文摘要：

采用粒度、XRD、IR等检测手段对煤直接液化用黄铁矿催化剂的超细粉碎进行了研究，分析了超细粉碎，包括干磨和湿磨两种不同粉碎方式，对粉体粒度、结构和性质变化的影响，及其对催化效果可能产生的影响。结果表明，超细粉碎黄铁矿时，湿磨的粉碎效果比干磨好；超细粉碎使黄铁矿粉体晶粒尺寸减小，晶格发生畸变，畸变率较小；超细粉碎使黄铁矿中的硫部分氧化成了硫酸根，湿磨过程中的氧化程度比干磨的小。从粉碎效率，粒度分布及氧化程度来考虑，制备粒度为1μm左右的煤直接液化用黄铁矿催化剂采用湿磨的方式较好。

英文摘要：

The ultrafine grinding of pyrite catalyst used in direct coal liquefaction was studied. Particle size analysis, XRD and IR measurements were used to analyze the changes of particle sizes, the structures and the properties which was caused by ultralfine grinding of dry grinding and wet grinding. The results indicate that wet grinding is better than dry grinding. The size of crystal grain of pyrite is decreased and the crystal lattice is distorted by grinding at the same time. The crystal lattice distortion ratio is little. The oxidation degree of wet grinding which means the number of sulfur in the pyrite oxidized into SO4^2- is smaller than that of dry grinding. Taking into consideration the grinding efficiency, the particle size distribution and the oxidation degree , wet grinding is better than dry grinding in preparing pyrite catalyst of 1μm particle diameter used in direct coal liquefaction.